Incidence Of Aflatoxin Contamination In Cassava (Manihot Esculenta Crantz)

Crisanta  E. Sajise,; Lina  L. Ilag,

Incidence Of Aflatoxin Contamination In Cassava (Manihot Esculenta Crantz)

Abstract:

The incidence of aflatoxin contamination in cassava roots at different stages of maturity and during processing and storage was determined. No aflatoxin was obtained from 7-to 14-month old cassava roots. During storage, however, trace amounts of aflatoxin B 1 were observed in stored cubes but not in stored chips and unprocessed roots. Blanching generally inhibited the growth of other fungi but not A. flavus. In the absence of competing fungi, fresh cassava roots may be a good substrate for the growth of A.flavus and A. parasiticus but not for aflatoxin production. A fluorescent compound behaving like aflatoxin B1 was observed in samples which were not dried after 48 hours as well as in unprocessed stored cassava roots showing vascular discoloration. Confirmatory test showed that it was not aflatoxin.

References:

ANDERSON, H.W., HEHRING, E.E. and WICHSER, W.R. 1975. Aflatoxin contamination of corn in the field. J. Agr. Food Chem. 23:775-782.
ASHWORTH, L.J., SCHROEDER, H.W. and LANGLEY, B.C. 1965. Aflatoxin environmental factors governing occurrence in Spanish peanuts. Science 148:1228-1229.
CAGAMPANG, G.B. and RODRIGUEZ, F.M. 1980. Methods of analy-sis for screening crops of appropriate qualities. IPB Bulletin No. 2. Analytical Service Lab. I.P.B., U.P. at Los Baños, p. 33.
CALDERWOOD, D.L. and SCHROEDER, H.W. 1968. Aflatoxin de-velopment and grade of undried rough rice following prolonged storage in aerated bins. U.S. Dept. Agr. Res. Serv. Rep. 52-56. 32p.
DIENER, U.L. 1976. Environmental factors influencing mycotoxin forma-tion in the contamination of foods. Proc. Amer. Phytopath. Soc. St. Paul, Minnesota. 3:126-139.
FENNEL, D.I., LILLEHOJ, E.B. and KWOLEK, W.F. 1975. Aspergillus flavus and other fungi associated with insect-damaged field corn. Cereal Chem. 52:314-321.
GALLOWAY, L.D. 1935. The moisture requirements of mold fungi with special reference to mildew in textiles. J. Textile Inst. Trans. 26:123-129.
ILAG, L.L. 1977. Comparative ability of various agricultural commodities to support aflatoxin formation. Abstract of paper presented at the 14^th annual meeting of the Phil. Phytopathological Society Inc., Bacolod City. 18-20 May 1977.
INGRAM, J.S. and HUMPHRIES, J.R.O. 1972. Cassava storage: A review. Trop. Sci. 14:131-148.
JONES, B.D. 1972. Methods of Aflatoxin Analyses. London, Tropical Products Institute Report G70. p. 32.
KNAKE, R.P. and DEYOE, C.W. 1973. Production of aflatoxin by Aspergillus parasiticus in maturing white corn. Poultry Sci. 52:20-49.
MAJUNDER, S.K., NARASIMHAN, K.S. and PARPIA, Η.Α.Β. 1965. Microecological factors of microbial spoilage and the occurrence of mycotoxins on stored grains. In Mycotoxins in Foodstuffs. G.N. Wogan (ed.). MIT Press, Cambridge. pp. 27-47.
MARSH, P.B. and TAYLOR, E.E. 1958. The geographic distribution of fiber containing fluorescent spots associated with Aspergillus flavus in in U.S. cotton crop. Plant Dis. Reptr. 42:1368-1371.
NAGARAJAN, V., BHAT, R.V. and TULPEELE, P.G. 1973. Aflatoxin-like factor in cassava (Manihot utillissima). Environ., Physio. and Biochem. 3:13-18.
NARTEY, F. 1966. Aflatoxin of Aspergillus flavus grown on cassava. Physiol. Plant. 19:818-822.
PANASSENKO, V.T. 1941. Mould fungi of confectionery goods and their control. Microbiology (USSR) 10:470-479.
PHILLIPS, T.P. 1974. Cassava Utilization and Potential Markets. Inter-national Development Research Centre. Ottawa, Canada. 1982 p.
RAMBO, G.W. and CALDWELL, R.W. 1974. Aspergillus flavus and aflatoxin in preharvest corn from Indiana in 1971 and 1972. Cereal Chem. 51:595-604.
SCHROEDER, H.W. 1969. Factors influencing the development of aflatoxin in some field crops. J. Stored Prod. Res. 5:187-192.
STOLOFF, I. 1976. Incidence, distribution, and disposition of products containing aflatoxins. Proc. Amer. Phytopath. Soc. (Minnesota) 3:156-171.
TUASON, M.A. and MADAMBA, L.S.P. 1980. Aflatoxin production in copra by Aspergillus flavus. Phil. Agric. 63:189-196.
WILDMAN, J.D., STOLOFF, L. and JACOBS, R. 1967. Aflatoxin production by a potent Aspergillus flavus Link. isolate. Biotechnology and Bio’eng. 9:420-437.
WOGAN, G.M. 1968. Aflatoxin risks and control measures. Fed. Proc. 27:932-938.